Red Bull motocross video – BTS: Ken Roczen Remakes MX Legend Jeremy McGrath’s Iconic Scene From Terrafirma 2. 2016 AMA Motocross champ Ken Roczen hops on board Jeremy McGrath’s 1996 Honda CR250 at the legendary Castillo Ranch in California in tribue to McGrath’s iconic segment from the classic motocross film, Terrafirma 2. 2 was rad, but Terrafirma 6 was the best!!